FireDAC.Comp.DataSet.TFDDataSet.EmptyView

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Delphi

procedure EmptyView;

C++

void __fastcall EmptyView();

Eigenschaften

Typ Sichtbarkeit Quelle Unit Übergeordnet
procedure
function
public
FireDAC.Comp.DataSet.pas
FireDAC.Comp.DataSet.hpp
FireDAC.Comp.DataSet TFDDataSet


Beschreibung

Removes all records visible in the dataset from the internal data storage of the dataset.

Call EmptyView to remove all records visible in the dataset from the internal data storage and from the changes log. This method is similar to EmptyDataSet. However, EmptyDataSet removes all records, while EmptyView removes the records accessible in the dataset after applying filters, ranges, etc.

Example

var
  i: Integer;
.....
  FDMemTable1.Close;
  FDMemTable1.FieldDefs.Clear;
  FDMemTable1.FieldDefs.Add('f1', ftInteger);
  FDMemTable1.FieldDefs.Add('f2', ftString, 20);
  FDMemTable1.CreateDataSet;
  for i := 1 to 100 do
    FDMemTable1.AppendRecord([i, 'qwe' + IntToStr(i)]);
  FDMemTable1.IndexFieldNames := 'f1';
  // remove all records with f1 >= 30 and f1 <= 60
  FDMemTable1.SetRange([30], [60]);
  FDMemTable1.EmptyView;
  FDMemTable1.CancelRange;

See Also